Is it possible for me to get a new retainer from my orthodontist without having treatment again? How long will this pain last?

So I missed a about a week or so of wearing my retainers and i recently just put them back on. I have extreme pain and my teeth ache a lot. I've been trying to wear them more often but the pain is still there and it has gotten worse. Also, i only got my braces off around last October (2015) and i have my orthodontist check up tomorrow. Please help.

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